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This file has been used in: Monitoring and assuring delivery (in en) 24. ofwat.gov.uk. Retrieved on 2015-10-21. * 2015-11-16: new path

This file has been used in: On the Case: December 2015 (in en). ofwat.gov.uk. Retrieved on 2015-12-19. web.archives.org

This file has been used in: On the Case – September 2016 – Issue 6 (in en). ofwat.gov.uk. Retrieved on 2017-11-26. web.archives.org

This file has been used in: Widoki z podróży [37] (in pl). latarnica.pl (2019-10-21). Retrieved on 2019-11-09. web.archives.org